Machine for making backings for artificial teeth



D. E. EVANS June 27, 1933.

MACHINE FOR MAKING BACKINGS FOR ARTIFICIAL TEETH Original Filed March 1, 1929 5 Sheets-Sheet l IIHIHIHI June 27, 1933. D. E. EVANS 1,916,101

MACHINE FOR MAKING BACKINGS FOR ARTIFICIAL TEETH Original Filed March 1, 1929 5 Sheets- Sheet 2 v June 27, 1933. I E, EVANS 1,916,101

MACHINE FOR MAKING BACKINGS FOR ARTIFICIAL TEETH Original Filed March 1, 1929 5 Sheets-Sheet 3 gwvemioz QLJ abtomug' D. E. EVANS June 27, 1933.

MACHINE .FOR MAKING BACKINGS FOR ARTIFICIAL TEETH June 27, 1933. D. E. EVANS 1,916,101

MACHINE FOR MAKING BACKINGS FOR ARTIFICIAL TEETH Original Filed March 1. 1929 '5 Sheets-Sheet 5 DAVID E. EVANS, OF COLUMBUS, OHIO, ASSIGNOR TO' THE COLUMBUS DENTAL MANU- Patented June 27, 1 9 33 1 UNITED STATES PATENT OFFICE,

FACTURING- COMPANY, OF COLUMBUS,- OI-IIO, A. CORPORATION MACHINE FORMAKING BACKINGS FOR ARTIFICIAL TEETH,

Original application filed March 1, 1929, Serial No. 343,767. Divided and this application filed runeae',

This application is a division of'my prior application filed March 1,1929, Serial No. 343,767. j

Artificial teeth now most commonly used for bridge work are what is known as intera lnents thereon, for such teeth, must be made with equal accuracy and when the backing consists of two parts they must be securely and accurately united, and it has heretorore been difficult to rivet t1 e backing and post with a joint sufficiently tight to prevent the solder, a dentist uses, from seeping through the joint around the rivet onto the face of the backing that comes into contact with the enamel tooth. Solder on this face is extremely objectionable, from many standbacking throughout the area of contact, which sets up strains and stresses on the points, the most important of which is that solder on the inner or porcelain contacting face of the backing whlch prevents a closeintimate contact between the porcelain and porcelain body that results in fracture of the porcelain at the joint between the post of the backing and the porcelain.

The object of my present invention is to provide a machine for making backings for artificial teeth embodying a novel construction of workholder, for holding the work firmly and securely in position for the action thereon of a riveting mechanism. The workholder constitutes the subjectmatter of the claims of this application, while the riveting mechanism constitutes the subject-matter of the claims of my aforesaid prior application No. 343,767.

In the drawings:

Figure 1 is a front elevation of a backing forming machine embodying my invention.

FigureQ is a top plan view of Figure 1.

Figure 3 is a sectional view on the lin 33 of Figure 1.

Serial No. 547,167.

Figure 4: is an enlarged detail view showingthe post clamping jaws in open-position.

Figure 5' is a similar view showing the jaws in closed position.

Figure 6 is an enlarged detail View riveting punch and associated parts.

or the Figure 7 is a view similar to Figure 6,

parts being in section.

Figure 8 1s a bottom plan view'of Figure 7.

I Figure 9 is a rear elevation of a tooth back- 7 ing embodying my invent-ion. j

1 Figure 10 is an assembly view of the back mg and post. I

Figure 11 is a bottom plan view of thejrivet former. v c

F 1gure12 is an enlarged detail View of the rivet joint between the backing and post on" the line 12-12, Figure 9. Figure 13 aws. V i

In the drawings the reference number 13 designates a swinging base or anvil which is pivotally suitably secured on the block Al The base 13 is provided with a fixed jaw 14 secured thereto by means of the set screws 15, which coacts with a movable jaw 16 pivotally mounted at 17*on the base 13, as more clearly shown in Figures 3, -l and5, the pivot pin 17 being seated in an opening in the base; The

' jaws 14 and 16 are each provided with a recess 18 in which a coiled spring 19 is seated, the spring bridging the joint between the two jaws as more clearly shown in Figure 5, whereby the jaws are, under certain conditions, opened, or rather the jaw 16 is moved from the aw 14; on its pivot 17. A pin 20 is also seated in these recesses 18 and is positioned within the spring 19, the outer end of the pin being firmly seated in'the movable jaw 16, said pin functioning, in a measure, as a centering guide for the jaws 1a and 16.

A block 21 is secured to the base at one end of thestationary jaw 14, by means of one of the screws 15, integral with which is an upstanding post 23 having a split upper end with a screw threaded opening at the bottom of the split in which opening is mounted a clamped by a set screw 25 after the gauge pin is a detail view of the clamp 24 has been adjusted thereby locking the pin 24 in its adjusted position against accidental displacement.

This anvil or base 13 is pivotally mounted on the block A by means of a pin 26 which is locked in position by means of the set screw 27, said block being provided with a stop 28 at its front edge.

The base 13 is provided with a set screw 29 which passes transversely through it at its swinging end, and is adapted to cooperate with the stop 28 on the block A to compen-, sate for wear. An operating handle 30 is pivoted at 31 to the pivoted base 13 and is provided with a cam head 32 which is adapted to engage the movable jaw 16 and move said jaw to and lock it in closed position against thestationary jaw 14. 33 is a stop 011 the base or anvil 13 which limits the inward movement of the handle 30 and functions as a fulcrum for the handle when the movable jaw is moved to open position, the outward movement of the base 13 being limited by the stop 28 on the block A.

The backing plate B is provided with rivet holes 0 while the post D is provided with a web E from the edge of which rivets F proect. 1

Referring now more specifically to Figures 1, 6, 7, 8 and 11 which show in detail the riveting mechanism, the block A is provided with a standard 34 on which a reciprocating head 35 is mounted (see Figure 1), said head being adapt-editor connection with a suitable actuating mechanism (not shown).

The head is provided-with a recess 36 in its lower end in which'the stem 37 of the punch assembly is held in any suitable manner.

A plate or head 38 is secured to the bottom of the stem 37 and is provided with a block 38a from the bottom of which extends the riveting swaging elements 381). A pin 380 extends upwardly from theplate 38 and en ters a hole in the head 35 to hold the plate 38 and post 37 against rotation. A plate 42 is provided with a central rectangular opening 43 in which the block 38a reciprocates, this plate 42 being provided with guide pins 43 which have a sliding fit in corresponding bores 44 in the plate 38, and said plates are held together by means of screw bolts, or pins 45Wh1Cl1 pins are threaded only on their end portions which engage the plate 42, the plate. 38 being free to slide upon the pins. These plates 08 and 42 are provided with recesses 39 in which coiled springs 40 are secured, which springs normally hold the plates from each other as shown in Figure 6, but.

permit the plates to close up as shown in Figure 7. Y

A shutter plate or cap 46 is secured to the under face of the plate 42 by means of screws 47, the plate 46 being provided with an insert 48 of harder metal in which is formed openings 49 through which the riveters 385 are adapted to pass, as shown in Figure 7 The shutter 46 is provided with a punch clearance, or centering depression concave recess 50 around the punch or rivet openings 49.

In operating the machine the parts are moved to the position shown in Figure 3 in which position the movable jaw 16 is moved away from the fixed jaw 14. The post D is then inserted between the jaws and moved until it is stopped by the gauge pin 24, the rivets F projecting above the jaws 14 and 16; the backing B is then fitted on the rivets F. The parts are now moved to the posi tion shown in Figure 2 and the handle 30 pulled outward whereby the cam 32 firmly clamps the jaws 16 against the post D, after which the riveter assembly is moved by power from the position shown in Figure 6 to the position shown in Figure 7 in which position the riveters 386 have swaged the metal of the ends of the posts F beyond the perimeter of the openings C of the backing, as shown in Figures 9 and 12, thereby completely sealing the joint between the rivets and backing against solder. As shown in Figure 7 the swaged metal of the rivets is confined between the walls of the rectangular opening 43 of the plate 42, thereby imparting a symmetrical perimeter to the rivet head and insuring an even thickness of metal throughout the head. After this operation the handle 30 is pushed inward and the base with associated parts is swung outward until.

certain amount of space must be provided to receive the web E of the post.

As shown in Figure 13, the aws each have a groove 50 to accommodate the post D above which the adjacent faces of the jaws form a slot 51 opening the grooves to the top face of the jaws to receive the web E of the post.

WVhat I claim is 1. In a work holder of the character described, a support, a base pivotally mounted on the support for swinging movement into and out of working position, relatively fixed and movable clamping members on the base for holding the work, means for normally holding the movable clamping member retracted, and an operating device for adjusting the base into and out of working position and controlling the clamping members, said device being movable in one direction to move the movable clamping member into clamping position and in another direction to release the movable clamping member.

2. In a work holder of the character de- I and out oi working position, relatively fixed to and froma .working position, a clamp carend on said support for swinging movement scribed, a support, a base pivotally mounted on the support for swinging movement into and movable clamping members on the base for holding the work, a spring for normally holding the movable clamping member do treated, and an operating device f r adjusting the base into and: out of working posi tion and controlling the clamping members",

said device beinglnovable one directionto; ove the movable clamping member into clamping position and another directionto release the movable elan'iping member;

In a work holder of theeharacter described, a support, a base pivotally mounted onthe support for swinging movement into and out of workingiposition, relatively fixed and movable clamping members on the;- base for holding the work, means for normally" holding the movable clamping member retreated, and apivotally mounted operating device for adjusting the base into and out of working'relation to the work tool and con; trolling the clamping meinbers, said device having a cam portion to engage the movable clampingmember to respectively project release the same on opposite swinging movements of said operatin'gt device.

4 In a device-of the kind described, a support pivotally mounted to swing horizontally to and from a working position, "a clamp oarried bysaid support and comprising a pair of stationery and movable jaw blocks extending longitudinally side by side,said movable jaw block being pivotally mounted at one end on said support for swinging movement on a vertical axis toward and from the stationary jaw block, the relatively inner or opposed faces of said jaw blocks being provided with complemental work receiving grooves disposed below and adjacent to the upper faces of the jaw blocks, an adjustable gauge parallel with the jaw blocks and supported in proximity to the pivoted end ofthe movable jaw block and extending longitudinally of and between the opposed faces of the jaw blocks and into said grooves, means for swinging the movable jaw block laterally outward relatively to the fixed jaw block, and 'means to swing the support and to clamp the movable jaw block into operative relation with the fixed jaw block.

5. In a device of the kind described, a support pivotally mounted to swing horizontally ried by said support and comprising a pair of stationary and movable jaw blocks extending longitudinally side by side, said movable j aw block being pivotally mounted at one on a vertical axis toward and from the stationary jaw block, the relatively inner or opposed faccs of said jaw blocks, being provided with complcmental work receiving, grooves disposed below and adjacent to the gauge parallel with the jaw blocks upperfaoes of the jaw block's, an adjustable" and Sll* ported in proximity to the pivoted endot t e movable jaw block and extending l ongitudi nall y of and between the opposed faees of tlie jaw blocks and into said grooves, means for swinging the movable jaw block laterally" relatively to the fixed jaw block, meansdor swinging the support into and out of working position, and a operated by the second-named means upon the movement of the support into working position to clamp the movable jaw block into v operative position with the fixedjaw block.

6a In adevice of the character described,-'a

support pivotally mounted to swing. horizon tally to and from a working: position, a clampon the support comprising a statiom: my jaw block and a movable jaw block 9X5 tending longitudinally side by side, said movablejaw block being pivotally mounted at? one end on said support for swinging move ment on a vertical axis toward and'froin the statioi iary jaw block, the relatively inner or op osed laces-of said jawblooks being pro-- vided with complemental work receiving grooves disposed below and adjacent to the upper faces oi the jaw blooks, an adjustable gauge arranged parallel with-the jaw blocks and supported in proximity to the pivoted end of the movable jaw blocks" and extending longitudinally of and between the'jawblocks and into said grooves, means for swinging support pivotally mounted for swinging movement into and out of working positlon,

extending longitudinally side by side, said movable jaw block being pivotally mounted at one end for swinging movement on a vertical axis toward and from the stationary jaw block, the relatively inner lateral faces of said j awblocks being provided with complemental work receiving, grooves disposed below and adjacent to the upper faces of the jaw blocks, an adjustable gauge arranged parallel with the jaw blocks supported in proximity to the pivoted end of the movable jaw block and extending therefrom longitudinally between the jaw blocks and into said grooves, and a spring for moving the movable jaw block laterally outward relatively to the fixed jaw block when the support is swung out of working position by the lever, said movable jaw being movable into operative relation. to the fixed jaw by said cam when the support'is swung into'working po si,

tion by the lever. 1

8. In a device of the character described, a support pivotally mounted at one end to swing laterally into and out of working position, an operating lever'pivotally secured to said support for swinging the same, a cam head on said lever, a clamp on said support comprising stationary and movable jaw blocks,extendinglongitudinally side by side, said movable jaw block being pivotally mounted at one end for movement on a vertical axis toward and from the stationary jaw block, the relatively inner lateral faces of said jaw blocks being provided. with complemental work receiving grooves disposed below and adjacent to the upper faces ofithe jaw blocks, an. adjustable gauge extending parallel with the jaw blocks and supported in proximity to the pivoted end of; the movable jaw and extending longitudinally therefrom betweenthe jaw blocks and into said grooves, va spring formoving the movable jaw block laterally outward relatively to the stationary jaw block when the support is swung out of operative position by the lever, said movable jaw block being movable into operative relation tothe stationary jaw block by said cam when the s'upportis swung into operative position by the lever,and a stop for limiting the outward swinging-movement of the support. v

9. In a device of thecharacter described, a

movement of the support.

of the jaw blocks, an adjustable gauge ar-,

ranged parallel with the jaw blocks and supported in proximity to the pivoted end of the I movable jaw block and extending longitudinally'therefrom between the jaw blocks and into said grooves, aspring for moving the movable jaw block laterally outward 1 relatively to the stationary jaw block when the support is swung out of operative position by the lever, said movable jaw block being movable into operative relation to the fixed jaw block by said cam when the support is movedinto operative position by the handle, a stop tolimit the inward movement of thesupport, and a stop to limit the outward In testimony whereof I affix my-signature.

DAVID E. EVANS. 

